A tipster recently wrote to tell us that Forever 21 didn't divide its wares into "men's" and "women's" categories — rather, its clothes were for "men" or "girls." We decided to investigate — and to take a look at what its competitors call their male and female customers. Below, a breakdown. Forever 21: At first… »12/19/11 5:40pm 12/19/11 5:40pm